Next Article in Journal
Two New Secondary Metabolites from the Endophytic Fungus Endomelanconiopsis endophytica
Next Article in Special Issue
Water Will Be the Coal of the Future—The Untamed Dream of Jules Verne for a Solar Fuel
Previous Article in Journal
A Novel Strategy for Biomass Upgrade: Cascade Approach to the Synthesis of Useful Compounds via C-C Bond Formation Using Biomass-Derived Sugars as Carbon Nucleophiles
Previous Article in Special Issue
Photocatalytic Water Splitting—The Untamed Dream: A Review of Recent Advances
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Molecules 2016, 21(7), 942; doi:10.3390/molecules21070942

Photoelectrochemical Behavior of Electrophoretically Deposited Hematite Thin Films Modified with Ti(IV)

1
Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via Fossato di Mortara 11–17, 44121 Ferrara, Italy
2
CNR/ISOF c/o Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via Fossato di Mortara 11–17, 44121 Ferrara, Italy
3
Department of Physics and Astronomy, University of Bologna, Viale Berti Pichat 6/2, 40127 Bologna, Italy
4
Department of Chemical Sciences, University of Padua, Via F. Marzolo 1, 35131 Padua, Italy
5
CNR ISTM, Via Fantoli 16/15, 20138 Milan, Italy
*
Authors to whom correspondence should be addressed.
Academic Editor: Derek J. McPhee
Received: 9 May 2016 / Revised: 13 July 2016 / Accepted: 15 July 2016 / Published: 20 July 2016
(This article belongs to the Special Issue Photocatalytic Water Splitting—the Untamed Dream)
View Full-Text   |   Download PDF [4529 KB, uploaded 20 July 2016]   |  

Abstract

Doping hematite with different elements is a common strategy to improve the electrocatalytic activity towards the water oxidation reaction, although the exact effect of these external agents is not yet clearly understood. Using a feasible electrophoretic procedure, we prepared modified hematite films by introducing in the deposition solution Ti(IV) butoxide. Photoelectrochemical performances of all the modified electrodes were superior to the unmodified one, with a 4-fold increase in the photocurrent at 0.65 V vs. SCE in 0.1 M NaOH (pH 13.3) for the 5% Ti-modified electrode, which was the best performing electrode. Subsequent functionalization with an iron-based catalyst led, at the same potential, to a photocurrent of ca. 1.5 mA·cm−2, one of the highest achieved with materials based on solution processing in the absence of precious elements. AFM, XPS, TEM and XANES analyses revealed the formation of different Ti(IV) oxide phases on the hematite surface, that can reduce surface state recombination and enhance hole injection through local surface field effects, as confirmed by electrochemical impedance analysis. View Full-Text
Keywords: electrophoresis; hematite; titanium; doping; passivation; water splitting; EIS electrophoresis; hematite; titanium; doping; passivation; water splitting; EIS
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

Supplementary material

Scifeed alert for new publications

Never miss any articles matching your research from any publisher
  • Get alerts for new papers matching your research
  • Find out the new papers from selected authors
  • Updated daily for 49'000+ journals and 6000+ publishers
  • Define your Scifeed now

SciFeed Share & Cite This Article

MDPI and ACS Style

Dalle Carbonare, N.; Boaretto, R.; Caramori, S.; Argazzi, R.; Dal Colle, M.; Pasquini, L.; Bertoncello, R.; Marelli, M.; Evangelisti, C.; Bignozzi, C.A. Photoelectrochemical Behavior of Electrophoretically Deposited Hematite Thin Films Modified with Ti(IV). Molecules 2016, 21, 942.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]

Molecules EISSN 1420-3049 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top